Plate Tectonics - Continental Drift

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What is the theory of plate tectonics?

Back

The geological theory that states that pieces of Earth's plates are in constant, slow motion, driven by convection currents.

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What drives the motion of Earth's plates?

Back

The force driving Earth's plates is described by the theory of plate tectonics.

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What was Pangaea?

Back

Pangaea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras, where all continents were joined together.

Front

What evidence supports the theory of continental drift?

Back

Fossils of tropical plants found in the Arctic and Antarctica suggest that continents were once in different positions.

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How do similar fossils support Wegener's hypothesis?

Back

Similar fossils found along continental margins that appear to join together support Wegener's hypothesis of continental drift.

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What is continental drift?

Back

The hypothesis that continents have moved over geological time from a common landmass.

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What are convection currents?

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Convection currents are the movement of fluid caused by differences in temperature and density, driving the motion of tectonic plates.

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What is subduction?

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Subduction is the process where one tectonic plate moves under another and sinks into the mantle.

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What are deep ocean trenches?

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Deep ocean trenches are the deepest parts of the ocean, formed by the subduction of tectonic plates.

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What is sea floor spreading?

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Sea floor spreading is the process by which new oceanic crust is formed at mid-ocean ridges and gradually moves away from the ridge.